Novel Directional Projection Screen using Diverted Curved Surfaces Cube Corner Reflector (D-CCR)

摘要

We devised and developed a novel directive projection screen for applications such as personal use, small group meeting, automotive pillar, and near-eye. This screen reflects and diffuses incident light at an angle Δθ_(view) around a direction deviated by θ_(view) from the direction of the projector. We realized the screen by employing a hollow cube corner retroreflector (CCR). The bottom surface of the CCR was tilted by θ_(view)/2 to change the direction of the reflected light by θ_(view) from the retro-reflection direction. Furthermore three side surfaces of the CCR (D-CCR) were curved to diffuse the light within a designed angle (θ_(view)±Δθ_(view)/2). We simulated a D-CCR with θ_(view)=10° and Δθ_(view)=16°, i.e., the viewing angle for a single D-CCR, 10°±8°, and fabricated a prototype. We verified closely the desired characteristics in which an optical gain of 16 was obtained.